Sharpness at 18mm

For these sharpness tests the Fujifilm 18mm lens was attached to a Fujifilm X-Pro1 body, which in turn was mounted on a sturdy tripod. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 18mm

The centre is sharp from f/2.8-11, with diffraction seting in at f/16. The edges are soft until f/5.6, with f/11 the optimum setting.